Isolated hypogonadotropic hypogonadism (IHH), also called idiopathic or congenital hypogonadotropic hypogonadism (CHH), as well as isolated or congenital gonadotropin-releasing hormone deficiency (IGD), is a condition which results in a small subset of cases of hypogonadotropic hypogonadism (HH) due to deficiency in or …
How do I know if I have an isolated gonadotropin deficiency?
Isolated gonadotropin deficiency is typically present at birth. Many boys with iHH are born with a penis that is smaller than normal. Other signs of iHH include: Failure to start puberty by age 17.
What two hormones are affected by Hypogonadotropic hypopituitarism?
The Gonadotropin deficiency of hypogonadotropic hypogonadism is due to insufficient pulsatile secretion of GnRH or lack of ability to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH) leading to delayed sexual maturation.
What is IHH illness?
Stephanie B. Seminara, MD, Massachusetts General Hospital. Brief Summary: The purpose of the study is to examine how Kallmann syndrome (KS) and idiopathic hypogonadotropic hypogonadism (IHH) affect reproductive hormones. These disorders are caused by a defect in Gonadotropin Releasing Hormone (GnRH) secretion.
How common is hypogonadotropic hypogonadism?
The incidence of congenital hypogonadotropic hypogonadism is approximately 1-10:100,000 live births, and approximately 2/3 and 1/3 of cases are caused by Kallmann syndrome (KS) and idiopathic hypogonadotropic hypogonadism, respectively.
What causes idiopathic hypogonadotropic hypogonadism?
Idiopathic hypogonadotropic hypogonadism is caused by an isolated defect in gonadotropin-releasing hormone (GnRH) release, action, or both. Other associated nonreproductive phenotypes, such as anosmia, cleft palate, and sensorineural hearing loss, occur with variable frequency.
Can hypogonadotropic hypogonadism be cured?
In most cases, hypogonadism can be treated effectively with HRT. This treatment consists of taking medications containing the hormone that your body is lacking, such as testosterone, estrogen and progesterone, or pituitary hormones to replace the ones that the body no longer produces.
How do you test for IHH?
The GnRH stimulation test appears to be the most widely used test in the differential diagnosis of IHH and CDP. This test can evaluate the hypothalamus–pituitary–gonadal (HPG) axis by stimulating the pituitary gland to secrete luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
What is Normosmic IHH?
Idiopathic hypogonadotropic hypogonadism (IHH) with normal sense of smell (normosmic IHH) or with anosmia (Kallmann syndrome) is a rare genetic disorder caused by an isolated defect in the secretion of GnRH by the hypothalamus or the action of GnRH on the pituitary gonadotrophins.
